Iielm von pokat



K. H. V. VON PORAT..

FEEDING DEVICE FOR PULVERULENT FUEL.

APPLICATION FILED MAY 4, I916.

Patented Oct. 21, 1919.

/N VIEW THE UNITED STATES OFFICE. v

KARL HJ'ALMAIB, VILHELM vou PORA'I, OI STOGKSUND, SWEDEN, ASSIGNOR I'OMO'IALA VEBKSTADS NYA AKTIEBOLAG, 0F MO'IALA VERKSTAD, SWEDEN.

FEEDING DEVICE FOR PULVERULENT FUEL.

Specification of Letters Patent.

- Patented Oct. 21, 1919.

' Application filed May 4, 1916. Serial No. 95,887.

King of Sweden, residing at Stocksund,

Sweden, have invented certain new and useful Improvements in FeedingDevices for Pulverulent Fuel, of which the following is v aspecification.

The present invention relates to such feeding devices for pulverulentfuel, in which the feeding is eflected by an air or gas current, whichacts on the powder, the feeding being controlled by increasing orreducing the size, speed or pressure of said airor gas current.Simultaneously also the combustion air may beproportioned in properrelation to the powder, and this may be' efiected by adjusting thecontrolling organs for the air and powder feeding simultaneously,preferably by hand, whereby the fire is controlled as desired. In suchfurnaces, where the combustion air is sucked in by the draft in thefurnace and this draft varies, as is the case in locomotives, the saidsimultaneous control of the air and powder feeding organs by hand is notsufiioient to,

maintain the proper relations between the air and powder, because agreater or less quantity of combustion air is sucked in according to thestrength of the draft. Thus also the powder feeding ought to becontrolled in the same relation as the combustion air is sucked in, sothat, after the powder and air feeding organs have been adjusted into acertain position, the both feedings are controlled automatically by thedraft in the furnace.

As before mentioned the fuel feeding at the said organ can also becontrolled by varying thequantity, speed or pressure of the air and gascurrent, which actuates the powder or passes through the organ and thepowder conduit, and which air and gas current consequently ought to bemade independent of the draft in the furnace, so that it varies in thesame degree as the draft. This is effected in the most simple way byallowing the draft in the furnace to create directly the air currentrequired for feeding the powder in the fuel conduit, that is the powderis sucked in by the' draft in the furnace in the same manner as thecombustion air.

In comparatively long fuel conduits or in conduits of relatively smalldiameter, where the draft in the furnace is not able to suck in thepowder, the air current in the powder conduit can be assisted by aninjector or the like, that is by suction, or by admitting pressure air,that is by pressure, in which case the arrangement preferably is such,in order to obtain variations in the air current in the powder conduit,corresponding to the draft in the furnace, that the controlling valvefor the steam passing to the injector or the motor, which drives ablowing machine or a controlling damper in the air conduit, is actuatedby the draft in the furnace or the means for causing the draft.

According to one embodiment of. the invention the mouths of two conduitsor series of conduits, the one admitting air or gas in the powder massand the other carrying the powder to the furnace, submerge into thepowder mass, the feeding being regulated by adjusting said mouths or byvarylng the pressure of the conveyed airor gas current or by both theseoperations simultaneously.

In the accompanying drawings,

Figure 1 shows a side elevation partly in section, of a tender and therear end of a locomotive, provided with a powder feeding deviceaccording to thisinvention.

I dig. 2 shows a cross section of the tender, an

Figs. 3, 4 and 5 show details of the powder feeding apparatus.

As shown in Figs. 1 and 2, the device for blowing the powder into thefurnace consists of an air pump or blowing machine 96, in which an airconduit 97 extends to the lower part of the powder receptacle 98. Theair conduit 97 may preferably be provided with a receiver 99, whichserves as an air holder. The conduit 97 is provided with a month 105,which opens into the powder receptacleceptacle and is by means of aleverand link mechanism, combined with a handle 107, so that the mouthcan be moved to and from the lower mouth of the tube 106 and the powdersupply thereby be controlled. The supply can be interrupted entirely bymoving the mouth up against the lower end of the tube 106, which end isformed as a seat for the mouth, as shown in Fig. 5. The pressure air,which in this event does not bring any powder with itself, will cleanthe conduit 106, especially if the air current is made somewhat morepowerful than during the powder feeding, which can be attained byallowing the air pump to operate with a greater speed.

Evidently all the air flowing from the mouth cannot continue to the tube106, but a part of the air will pass along the inclined plate bottom, onwhich the powder rests and hence up to the chamber 108 above the powder,said chamber being air-tight so that the same pressure is existing thereas between the mouth 105 and the end of the tube 106. On account of theair passing along the bottom carrying the powder mass the frictionbetween the powder and the bottom is materially reduced, so that thepowder-will easil' slide downward. If the powder is choke up in thereceptacle, the conduit 106 is closed by means of the cock 109 and theair is blown out from the chamber 108 by opening a suitable pet cocksimultaneously as the speed of the air pum 96 and thus also the airpressure is increase Thereby the whole pulverulent mass is lifted andstirred so that loosened powder again runs down to the mouth of the tube106.

Figs. 3 and 4: show different embodiments of the mouth and the lower endof the tube 106. The lower edge of this latter must, however, always berounded for the purpose of preventing peat fibers from fastening on theedge.

What I claim is:

1. In a feeding device for pulverulent fuel, a powder receptacle, a fueloutlet pipe,

a pipe for supplying a gaseous medium into the receptacle, said pipeextending from the outside of the receptacle through the 'wall to theinterior thereof, the receiving mouth of said fuel outlet pipe beingfaced downward, said supply pipe having openings for causing the gaseousmedium to flow outwardly in practically all lateral directions withrespect to the axis of the delivering end of said pipe immediatelybefore escaping together with a quantity, of powder through the fueloutlet pipe, the discharge openings of the gas pipe being located atsome distance above the bottom of receptacle, which latter is contracteddownward and has the pipe ends located in the lower contracted art.

2. Ina feeding device for pulverulent fuel, a owder receptacle, a fueloutlet pipe, a pipe or supplying a gaseous medium into the receptacle,said p1pe extending from the outside of the receptacle through the wallto the interior thereof, means for preventing the fuel from falling'bygravity into the fuel pipe outlet, the discharge end of the gas supplypipe being located below the receiving mouth of the fuel outlet pipe butprojecting into the interior of the receptacle at some distance abovethe bottom of the receptacle and being provided with a plurality of fineholes distributed practically on all sides of the pipe, the walls of thereceptacle converging downward and the pipe ends being located at thelower contracted part of receptacle.

3. In a feeding device for pulverulent fuel, a powder receptacle, a fueloutletpipe, a pipe for supplying a gaseous medium into the receptacle,said p1pe extending from the outside of the receptacle through the wallto the interior thereof, the receiving mouth of said fuel outlet pipebeing faced downward, one of the adjacent ends of said two pipes beingadjustably -mounted by a means of a handle mechanically connected withsaid adjustable end, the discharge end of the gas supply pipe beinglocated below the receiving mouth of the fuel outlet pipe and beingprovided with a plurality of fine holes forming the outlet of the gaspipe, said perforated end being formed in such a way that in the oneposition of the adjustable pipe end both pipes are closed fromcommunication with the receptacle.

4. In a feeding device for pulverulent fuel, a powder receptacle havingits lower portion contracted downwardly, a fuel outlet pipe, a pipe forsupplying a gaseous medium into the receptacle said pipe extending fromthe outside of the receptacle through the wall to the interior thereof,the receiving mouth of said fuel outlet pipe being faced downward, thedischarge part of the gas supply pipe projecting upward through thebottom of the receptacle which is contracted downwardly, and the top ofsaid discharge part being formed as a cone having a plurality ofdischarge openings distributed on its whole periphery.

.5. In a feeding device for pulverulent fuel in locomotives, thecombination of a furnace, a tender provided with a powder receptaclecontracted downwardly, a fuel receptacle but at some distance above thebottom of the receptacle, the receiving mouth of said fuel outlet pipebeing faced downward, one of the adjacent ends of said two pipes beingadjustable by means of a halndle which is mechanically connected withsaid adjustable end and 1s convemently accessible from the locomotivecabin, means for preventing the essential part of the gaseous medium,for feeding the fuel from the receptacle through the fuel outlet pipe,from passing in a straight line from the outlet of the gas supply pipeto the receiving mouth of the fuel outlet pipe.

6. In a feeding device for pulverulent fuel, a powder receptacle whichis closed at the top and contracted downward, a fuel outlet pipe, havingits receiving mouth faced downward,'a pipe for supplying a gaseousmedium into the receptacle, said latter pipe extending from a blowingmachine through the bottom of the receptacle so as to deliver thegaseous medium below the said fuel receiving mouth, the discharge end ofthe gas supply pipe being slidably mounted inthe bottom of'thereceptacle and having an outlet at its upper end which causes theaseous'medium to flow out substantially aterally, the said slidabledischarge end being mechanically connected with a handle located at theoutside of the receptacle at a higher point than the bottom of thereceptacle.

7. In a feeding device for pulverulent, fuel, a powder receptacle, afuel outlet pipe, a pipe for supplying a gaseous medium into thereceptacle, said pipe extending from the outside of the receptaclethrough the wall to the interior thereof, the vreceiving mouth of saidfuel pipe being faced downward, said mouth and the outlet of the airsupply pipe bein the receptacle,

I spaced from each other, so that there W11 exist a mixin chamber forthe gaseous medium and the fuel below the said recelvmg mouth, theoutlet of the gas supply pipe being formed by a plurality of gas disacharge openings lying at different heights in the receptacle, thereceptacle being contracted downward and having the adjacent pipe endslocated in the'lower part but at 8. In a feeding device for fuel, apowder receptacle,

i some distance from the bottom of receptacle. pulverulent a fuel outletpipe,

a pipe for supplying a gaseous medium into said pipe extending from thereceptacle through the wall thereof, the receiving mouth outside of theto the interior of said fuel pipe being faced downward,

sald mouth and the outlet of the air supply 5 pipe being spaced fromeach other so that there will exlst a mixing, chamber for the gaseousmedium and'the fuel below the said receiving mouth, the outlet of thegas supply pipe belng formed by a plurality of as discharge openingslying at different heig ts 1n the receptacle, the receptacle beingcontracted downward and having the adjacent JON PORAT.

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